linux-kernel - Re: [PATCH v3 03/13] bus/fsl-mc: add support for 'driver

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Message-ID: <20200706135717.GB919533@lunn.ch>
Date:   Mon, 6 Jul 2020 15:57:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Diana Craciun <diana.craciun@....com>
Cc:     linux-kernel@...r.kernel.org, laurentiu.tudor@....com,
        gregkh@...uxfoundation.org, stuyoder@...il.com, leoyang.li@....com,
        bharatb.linux@...il.com, Diana Craciun <diana.craciun@....nxp.com>,
        Bharat Bhushan <Bharat.Bhushan@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 03/13] bus/fsl-mc: add support for 'driver_override'
 in the mc-bus

Hi Diana

On Mon, Jul 06, 2020 at 03:42:33PM +0300, Diana Craciun wrote:
> From: Bharat Bhushan <Bharat.Bhushan@....com>
> 
> This patch is required for vfio-fsl-mc meta driver to successfully bind
> layerscape container devices for device passthrough. This patch adds
> a mechanism to allow a layerscape device to specify a driver rather than
> a layerscape driver provide a device match.
> 
> Example to allow a device (dprc.1) to specifically bind
> with driver (vfio-fsl-mc):-
>  - echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.1/driver_override
>  - echo dprc.1 > /sys/bus/fsl-mc/drivers/fsl_mc_dprc/unbind
>  - echo dprc.1 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind

Something i asked before, why is this buried in a driver, when it
could be put in the driver core. This is not the only driver doing
this, so it does make sense to share the code and bugs.

      Andrew